Albree Trulog Duplex Circular Logarithm Table

Description:

This is Norman Albree's pilot model for a two-sided circular logarithmic chart. The side labeled A has a double logarithmic scale arranged in a spiral of seven turns. Its outer edge is marked from 1 to 3.15. The inner edge is marked from .0 to .5. The side labeled B also has a spiral double logarithmic scale, marked from .315 to 1 on the outer edge and from .5 to 1 on the inner edge. A clear plastic cursor folds over the edge of the instrument and is pivoted at the center on both sides.

The A side is marked inside the fourth spiral: 19©45, and at the center: TRULOG DUPLEX. The B side is marked inside the fourth spiral: 19©45 (/) G. N. Albree, and at the center: G. NORMAN ALBREE. The instrument was received with a hand-sewn brown leather pouch. George Norman Albree, the inventor and donor, was an aeronautical engineer. See also MA.335484 and MA.335486.

Date Made: after 1945

Maker: Albree, G. Norman

Location: Currently not on view

Place Made: United States: Massachusetts, Boston

Subject: Rule, CalculatingChart, LogarithmicMathematics

Subject:

See more items in: Medicine and Science: Mathematics, Science & Mathematics, Slide Rules

Exhibition:

Exhibition Location:

Credit Line: Gift of G. Norman Albree

Data Source: National Museum of American History

Id Number: MA.335487Catalog Number: 335487Accession Number: 321674

Object Name: slide rule

Physical Description: paper (part material)plastic (cursor material)wood (overall material)metal (part material)Measurements: overall: 1.5 cm x 26.2 cm x 24.5 cm; 19/32 in x 10 5/16 in x 9 21/32 in

Guid: http://n2t.net/ark:/65665/ng49ca746aa-8eb1-704b-e053-15f76fa0b4fa

Record Id: nmah_1215052

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